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                        Python高级
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                            <b>1.</b>
                        
                        Python语法高级专题1
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                        property属性
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                            <b>2.3.</b>
                        
                        魔法属性和方法
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                        with管理上下文
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                            <b>3.</b>
                        
                        Python语法之装饰器
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                            <b>3.1.</b>
                        
                        闭包
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                        装饰器
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                            <b>3.3.</b>
                        
                        总结
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                            <b>4.</b>
                        
                        MySQL数据库基本操作
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                            <b>4.1.</b>
                        
                        数据库概述
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                            <b>4.2.</b>
                        
                        数据完整性
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                            <b>4.3.</b>
                        
                        图形化客户端Navicat
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                            <b>4.4.</b>
                        
                        命令行客户端SQL的使用
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                            <b>4.4.1.</b>
                        
                        登录和退出数据库
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                            <b>4.4.2.</b>
                        
                        表结构的操作
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                            <b>4.4.3.</b>
                        
                        数据库的操作
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                            <b>4.4.4.</b>
                        
                        表数据的操作
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                            <b>4.5.</b>
                        
                        知识总结
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                            <b>5.</b>
                        
                        MYSQL数据库进阶操作
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                            <b>5.1.</b>
                        
                        练习强化
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                            <b>5.2.</b>
                        
                        条件
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                            <b>5.3.</b>
                        
                        排序
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                            <b>5.4.</b>
                        
                        分页
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                            <b>5.5.</b>
                        
                        聚合函数
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                            <b>5.6.</b>
                        
                        分组
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                            <b>5.7.</b>
                        
                        连接
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                            <b>5.8.</b>
                        
                        自连接
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                            <b>5.9.</b>
                        
                        子查询
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                            <b>5.10.</b>
                        
                        总结
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                            <b>6.</b>
                        
                        MYSQL数据库编程
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                            <b>6.1.</b>
                        
                        数据准备
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                            <b>6.2.</b>
                        
                        SQL演练
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                            <b>6.3.</b>
                        
                        数据库设计
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                            <b>6.4.</b>
                        
                        数据库编程
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                            <b>6.5.</b>
                        
                        总结
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                            <b>7.</b>
                        
                        MySQL数据库高级用法
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                            <b>7.1.</b>
                        
                        视图
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                            <b>7.2.</b>
                        
                        事务
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                            <b>7.3.</b>
                        
                        索引
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                        用户管理
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                            <b>7.5.</b>
                        
                        主从配置
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                            <b>7.6.</b>
                        
                        总结
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                            <b>8.</b>
                        
                        miniweb框架
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                            <b>8.1.</b>
                        
                        框架概念
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                            <b>8.2.</b>
                        
                        实现一个简单的框架
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                            <b>8.3.</b>
                        
                        模板替换
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                            <b>8.4.</b>
                        
                        路由概念
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                            <b>8.5.</b>
                        
                        股票收藏夹
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                            <b>8.6.</b>
                        
                        复习
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</ul>
<h2 id="42-&#x9B54;&#x6CD5;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x6982;&#x89C8;">4.2 &#x9B54;&#x6CD5;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x6982;&#x89C8;</h2>
<p>&#x65E0;&#x8BBA;&#x4EBA;&#x6216;&#x4E8B;&#x7269;&#x5F80;&#x5F80;&#x90FD;&#x6709;&#x4E00;&#x4E9B;&#x542B;&#x6709;&#x7279;&#x6B8A;&#x542B;&#x4E49;&#x7684;&#x6587;&#x5B57;&#xFF0C;Python&#x7684;&#x7C7B;&#x5C5E;&#x6027;&#x4E5F;&#x662F;&#x5982;&#x6B64;&#xFF0C;&#x5B58;&#x5728;&#x7740;&#x4E00;&#x4E9B;&#x5177;&#x6709;&#x7279;&#x6B8A;&#x542B;&#x4E49;&#x7684;&#x5C5E;&#x6027;, &#xFF0C;&#x8BE6;&#x60C5;&#x5982;&#x4E0B;&#xFF1A;</p>
<h2 id="421-doc">4.2.1 __doc__</h2>
<ul>
<li>&#x8868;&#x793A;&#x7C7B;&#x7684;&#x63CF;&#x8FF0;&#x4FE1;&#x606F;</li>
</ul>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span>:</span>
    <span class="hljs-string">&quot;&quot;&quot; &#x63CF;&#x8FF0;&#x7C7B;&#x4FE1;&#x606F;&#xFF0C;&#x8FD9;&#x662F;&#x7528;&#x4E8E;&#x770B;&#x7247;&#x7684;&#x795E;&#x5947; &quot;&quot;&quot;</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">func</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-keyword">pass</span>

print(Foo.__doc__)
<span class="hljs-comment">#&#x8F93;&#x51FA;&#xFF1A;&#x7C7B;&#x7684;&#x63CF;&#x8FF0;&#x4FE1;&#x606F;</span>
</code></pre>
<h2 id="422-module-&#x548C;--class">4.2.2 __module__ &#x548C;  __class__</h2>
<ul>
<li>__module__ &#x8868;&#x793A;&#x5F53;&#x524D;&#x64CD;&#x4F5C;&#x7684;&#x5BF9;&#x8C61;&#x5728;&#x90A3;&#x4E2A;&#x6A21;&#x5757;</li>
<li>__class__ &#x8868;&#x793A;&#x5F53;&#x524D;&#x64CD;&#x4F5C;&#x7684;&#x5BF9;&#x8C61;&#x7684;&#x7C7B;&#x662F;&#x4EC0;&#x4E48;</li>
</ul>
<p><code>test.py</code></p>
<pre><code class="lang-python"><span class="hljs-comment"># -*- coding:utf-8 -*-</span>

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Person</span><span class="hljs-params">(object)</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self)</span>:</span>
        self.name = <span class="hljs-string">&apos;laowang&apos;</span>
</code></pre>
<p><code>main.py</code></p>
<pre><code class="lang-python"><span class="hljs-keyword">from</span> test <span class="hljs-keyword">import</span> Person

obj = Person()
print(obj.__module__)  <span class="hljs-comment"># &#x8F93;&#x51FA; test &#x5373;&#xFF1A;&#x8F93;&#x51FA;&#x6A21;&#x5757;</span>
print(obj.__class__)  <span class="hljs-comment"># &#x8F93;&#x51FA; test.Person &#x5373;&#xFF1A;&#x8F93;&#x51FA;&#x7C7B;</span>
</code></pre>
<h3 id="423-init">4.2.3 __init__</h3>
<ul>
<li>&#x521D;&#x59CB;&#x5316;&#x65B9;&#x6CD5;&#xFF0C;&#x901A;&#x8FC7;&#x7C7B;&#x521B;&#x5EFA;&#x5BF9;&#x8C61;&#x65F6;&#xFF0C;&#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C;</li>
</ul>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Person</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name)</span>:</span>
        self.name = name
        self.age = <span class="hljs-number">18</span>


obj = Person(<span class="hljs-string">&apos;laowang&apos;</span>)  <span class="hljs-comment"># &#x81EA;&#x52A8;&#x6267;&#x884C;&#x7C7B;&#x4E2D;&#x7684; __init__ &#x65B9;&#x6CD5;</span>
</code></pre>
<h3 id="424-del">4.2.4 __del__</h3>
<ul>
<li>&#x5F53;&#x5BF9;&#x8C61;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x88AB;&#x91CA;&#x653E;&#x65F6;&#xFF0C;&#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C;&#x3002;</li>
</ul>
<p>&#x6CE8;&#xFF1A;&#x6B64;&#x65B9;&#x6CD5;&#x4E00;&#x822C;&#x65E0;&#x987B;&#x5B9A;&#x4E49;&#xFF0C;&#x56E0;&#x4E3A;Python&#x662F;&#x4E00;&#x95E8;&#x9AD8;&#x7EA7;&#x8BED;&#x8A00;&#xFF0C;&#x7A0B;&#x5E8F;&#x5458;&#x5728;&#x4F7F;&#x7528;&#x65F6;&#x65E0;&#x9700;&#x5173;&#x5FC3;&#x5185;&#x5B58;&#x7684;&#x5206;&#x914D;&#x548C;&#x91CA;&#x653E;&#xFF0C;&#x56E0;&#x4E3A;&#x6B64;&#x5DE5;&#x4F5C;&#x90FD;&#x662F;&#x4EA4;&#x7ED9;Python&#x89E3;&#x91CA;&#x5668;&#x6765;&#x6267;&#x884C;&#xFF0C;&#x6240;&#x4EE5;&#xFF0C;__del__&#x7684;&#x8C03;&#x7528;&#x662F;&#x7531;&#x89E3;&#x91CA;&#x5668;&#x5728;&#x8FDB;&#x884C;&#x5783;&#x573E;&#x56DE;&#x6536;&#x65F6;&#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C;&#x7684;&#x3002;</p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__del__</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-keyword">pass</span>
</code></pre>
<h3 id="425-call">4.2.5 __call__</h3>
<ul>
<li>&#x5BF9;&#x8C61;&#x540E;&#x9762;&#x52A0;&#x62EC;&#x53F7;&#xFF0C;&#x89E6;&#x53D1;&#x6267;&#x884C;&#x3002;</li>
</ul>
<p>&#x6CE8;&#xFF1A;__init__&#x65B9;&#x6CD5;&#x7684;&#x6267;&#x884C;&#x662F;&#x7531;&#x521B;&#x5EFA;&#x5BF9;&#x8C61;&#x89E6;&#x53D1;&#x7684;&#xFF0C;&#x5373;&#xFF1A;<code>&#x5BF9;&#x8C61; = &#x7C7B;&#x540D;()</code> &#xFF1B;&#x800C;&#x5BF9;&#x4E8E; __call__ &#x65B9;&#x6CD5;&#x7684;&#x6267;&#x884C;&#x662F;&#x7531;&#x5BF9;&#x8C61;&#x540E;&#x52A0;&#x62EC;&#x53F7;&#x89E6;&#x53D1;&#x7684;&#xFF0C;&#x5373;&#xFF1A;<code>&#x5BF9;&#x8C61;()</code> &#x6216;&#x8005; <code>&#x7C7B;()()</code></p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-keyword">pass</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__call__</span><span class="hljs-params">(self, *args, **kwargs)</span>:</span>
        print(<span class="hljs-string">&apos;__call__&apos;</span>)


obj = Foo()  <span class="hljs-comment"># &#x6267;&#x884C; __init__</span>
obj()  <span class="hljs-comment"># &#x6267;&#x884C; __call__</span>
</code></pre>
<h3 id="426-dict">4.2.6 __dict__</h3>
<ul>
<li>&#x7C7B;&#x6216;&#x5BF9;&#x8C61;&#x4E2D;&#x7684;&#x6240;&#x6709;&#x5C5E;&#x6027;</li>
</ul>
<p>&#x7C7B;&#x7684;&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;&#x5C5E;&#x4E8E;&#x5BF9;&#x8C61;&#xFF1B;&#x7C7B;&#x4E2D;&#x7684;&#x7C7B;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x7B49;&#x5C5E;&#x4E8E;&#x7C7B;&#xFF0C;&#x5373;&#xFF1A;</p>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Province</span><span class="hljs-params">(object)</span>:</span>
    country = <span class="hljs-string">&apos;China&apos;</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name, count)</span>:</span>
        self.name = name
        self.count = count

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">func</span><span class="hljs-params">(self, *args, **kwargs)</span>:</span>
        print(<span class="hljs-string">&apos;func&apos;</span>)

<span class="hljs-comment"># &#x83B7;&#x53D6;&#x7C7B;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x5373;&#xFF1A;&#x7C7B;&#x5C5E;&#x6027;&#x3001;&#x65B9;&#x6CD5;&#x3001;</span>
print(Province.__dict__)
<span class="hljs-comment"># &#x8F93;&#x51FA;&#xFF1A;{&apos;__dict__&apos;: &lt;attribute &apos;__dict__&apos; of &apos;Province&apos; objects&gt;, &apos;__module__&apos;: &apos;__main__&apos;, &apos;country&apos;: &apos;China&apos;, &apos;__doc__&apos;: None, &apos;__weakref__&apos;: &lt;attribute &apos;__weakref__&apos; of &apos;Province&apos; objects&gt;, &apos;func&apos;: &lt;function Province.func at 0x101897950&gt;, &apos;__init__&apos;: &lt;function Province.__init__ at 0x1018978c8&gt;}</span>

obj1 = Province(<span class="hljs-string">&apos;&#x5C71;&#x4E1C;&apos;</span>, <span class="hljs-number">10000</span>)
print(obj1.__dict__)
<span class="hljs-comment"># &#x83B7;&#x53D6; &#x5BF9;&#x8C61;obj1 &#x7684;&#x5C5E;&#x6027;</span>
<span class="hljs-comment"># &#x8F93;&#x51FA;&#xFF1A;{&apos;count&apos;: 10000, &apos;name&apos;: &apos;&#x5C71;&#x4E1C;&apos;}</span>

obj2 = Province(<span class="hljs-string">&apos;&#x5C71;&#x897F;&apos;</span>, <span class="hljs-number">20000</span>)
print(obj2.__dict__)
<span class="hljs-comment"># &#x83B7;&#x53D6; &#x5BF9;&#x8C61;obj1 &#x7684;&#x5C5E;&#x6027;</span>
<span class="hljs-comment"># &#x8F93;&#x51FA;&#xFF1A;{&apos;count&apos;: 20000, &apos;name&apos;: &apos;&#x5C71;&#x897F;&apos;}</span>
</code></pre>
<h3 id="427-str">4.2.7 __str__</h3>
<ul>
<li>&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x7C7B;&#x4E2D;&#x5B9A;&#x4E49;&#x4E86;__str__&#x65B9;&#x6CD5;&#xFF0C;&#x90A3;&#x4E48;&#x5728;&#x6253;&#x5370; &#x5BF9;&#x8C61; &#x65F6;&#xFF0C;&#x9ED8;&#x8BA4;&#x8F93;&#x51FA;&#x8BE5;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x3002;</li>
</ul>
<pre><code class="lang-python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__str__</span><span class="hljs-params">(self)</span>:</span>
        <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;laotie&apos;</span>


obj = Foo()
print(obj)
<span class="hljs-comment"># &#x8F93;&#x51FA;&#xFF1A;laotie</span>
</code></pre>
<h3 id="428-getitem&#x3001;setitem&#x3001;delitem">4.2.8 __getitem__&#x3001;__setitem__&#x3001;__delitem__</h3>
<ul>
<li>&#x7528;&#x4E8E;&#x7D22;&#x5F15;&#x64CD;&#x4F5C;&#xFF0C;&#x5982;&#x5B57;&#x5178;&#x3002;&#x4EE5;&#x4E0A;&#x5206;&#x522B;&#x8868;&#x793A;&#x83B7;&#x53D6;&#x3001;&#x8BBE;&#x7F6E;&#x3001;&#x5220;&#x9664;&#x6570;&#x636E;</li>
</ul>
<pre><code class="lang-python"><span class="hljs-comment"># -*- coding:utf-8 -*-</span>

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span><span class="hljs-params">(object)</span>:</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__getitem__</span><span class="hljs-params">(self, key)</span>:</span>
        print(<span class="hljs-string">&apos;__getitem__&apos;</span>, key)

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__setitem__</span><span class="hljs-params">(self, key, value)</span>:</span>
        print(<span class="hljs-string">&apos;__setitem__&apos;</span>, key, value)

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__delitem__</span><span class="hljs-params">(self, key)</span>:</span>
        print(<span class="hljs-string">&apos;__delitem__&apos;</span>, key)


obj = Foo()

result = obj[<span class="hljs-string">&apos;k1&apos;</span>]      <span class="hljs-comment"># &#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C; __getitem__</span>
obj[<span class="hljs-string">&apos;k2&apos;</span>] = <span class="hljs-string">&apos;laotie&apos;</span>    <span class="hljs-comment"># &#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C; __setitem__</span>
<span class="hljs-keyword">del</span> obj[<span class="hljs-string">&apos;k1&apos;</span>]           <span class="hljs-comment"># &#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6267;&#x884C; __delitem__</span>
</code></pre>
<h2 id="43-&#x95EE;&#x9898;">4.3 &#x95EE;&#x9898;</h2>
<p>&#x4E3E;&#x4F8B;&#x8BF4;&#x51FA;&#x4E09;&#x79CD;&#x9B54;&#x6CD5;&#x5C5E;&#x6027;&#x7684;&#x610F;&#x4E49;&#x3002;</p>

                    
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